现浇X形桩桩-土荷载传递规律现场试验研究

›› 2012, Vol. 33 ›› Issue (2): 489-493.

现浇X形桩桩-土荷载传递规律现场试验研究

丁选明^{1, 2}，孔纲强^{1, 2, 3}，刘汉龙^{1, 2}，吕亚茹^{1, 2}

1.岩土力学与堤坝工程教育部重点实验室，南京 210098；2.河海大学岩土工程科学研究所，南京 210098； 3. Department of Civil Engineering, The University of Akron, Akron, Ohio 44325-3905, USA

收稿日期:2010-07-24 出版日期:2012-02-10 发布日期:2012-02-14
通讯作者: 孔纲强，男，1982年生，博士，副教授，主要从事软土地基处理及桩基础方面的研究工作。E-mail: gqkong1@163.com E-mail:dxmhhu@163.com
作者简介:丁选明，男，1980年生，博士，副研究员，主要从事软土地基处理及桩基动力特性研究工作
基金资助:
国家自然科学基金青年项目（No. 51008116）；国家杰出青年科学基金项目资助（No. 50825901）。

Field test study of pile-soil load transfer characteristics of X-shaped cast-in-place pile

DING Xuan-ming^{1, 2}, KONG Gang-qiang^{1, 2, 3}, LIU Han-long^{1, 2}, LÜ Ya-ru^{1, 2}

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Department of Civil Engineering, The University of Akron, Akron, Ohio 44325-3905, USA

Received:2010-07-24 Online:2012-02-10 Published:2012-02-14

摘要/Abstract

摘要： 现浇X形混凝土桩（简称X形桩）是为了更好地满足沿海、沿江软土地基处理应用而开发的一种新桩型。该新型桩具有比表面积大、侧向摩阻力高，施工便捷，经济效益高等技术经济优势；但针对其在复合地基中桩-土荷载传递规律特性的研究却相对较少。结合某污水处理厂软基处理工程，开展了X形桩复合地基中桩-土荷载传递规律的现场试验，测得了荷载-沉降关系，桩-土荷载分担比、桩-土应力比，以及桩身轴力等发展情况，分析了不同工况下复合地基中桩-土协调相互作用和中性点位置规律；并将等混凝土用量圆形桩和X形桩的单桩静载荷试验作为对比分析。研究结果表明，本文试验条件下复合地基中X形桩桩侧正、负摩阻力转化发生在0.2倍桩长处，桩侧正摩阻力最大值约为其负摩阻力最大值的140 %；相同桩长情况下桩-土应力比随竖向荷载等级增长速率随桩间距的增加而减小。

关键词: 现浇X形桩, 复合地基, 现场试验, 桩-土荷载传递, 桩-土应力比, 中性面

Abstract: A new pile type, X-shaped cast-in-place concrete pile (XCC pile) was developed for coast or river soft soils treatment. XCC piles have many technical and economic advantages, such as large surface area, high shaft friction, conveniently construction, and high economic effects. But there were relative little studies focused on the pile-soil load transfer characteristics of XCC pile composite foundation. Based on a sewage treatment plant soft ground improvement engineering, field tests for the pile-soil load transfer of XCC pile composite foundation were carried out. The load-settlement, pile-soil load sharing, pile-soil stress ratio, and the distributions of axial force of pile shaft were measured. Then the pile-soil interaction and neutral plane of XCC pile under different conditions were analyzed. In order to do comparative analysis, the static load tests for circular pile which has the same concrete amount with that of XCC pile were carried out. The results show that, the neutral plane of XCC pile in composite foundation is mainly occurred in 0.2 times of pile depth. The maximum value of positive skin friction is about 140 % of those of negative skin friction. The pile-soil stress ratio of XCC pile in composite foundation is increased with the decreasing of pile spacing under the same pile length.

Key words: XCC pile, composite foundation, field test, pile-soil load transfer, pile-soil stress ratio, neutral plane

中图分类号:

TU 473.1

丁选明，孔纲强，刘汉龙，吕亚茹. 现浇X形桩桩-土荷载传递规律现场试验研究[J]. , 2012, 33(2): 489-493.

DING Xuan-ming , KONG Gang-qiang , LIU Han-long , Lü Ya-ru. Field test study of pile-soil load transfer characteristics of X-shaped cast-in-place pile[J]. , 2012, 33(2): 489-493.

参考文献

相关文章 15

[1]	黄宇华, 徐林荣, 周俊杰, 蔡雨, . 基于改进Terzarghi方法的桩网地基桩土应力计算[J]. 岩土力学, 2020, 41(2): 667-675.
[2]	陆晨凯, 孔纲强, 孙广超, 陈斌, 殷高翔, . 桩−筏基础中能量桩热−力耦合特性现场试验[J]. 岩土力学, 2019, 40(9): 3569-3575.
[3]	冯君, 王洋, 吴红刚, 赖冰, 谢先当, . 玄武岩纤维复合材料土层锚杆抗拔性能现场试验研究[J]. 岩土力学, 2019, 40(7): 2563-2573.
[4]	吴爽爽, 胡新丽, 龚辉, 周昌, 徐楚, 王强, 应春业, . 3种模式下钻孔灌注桩桩-土剪切特性现场试验研究[J]. 岩土力学, 2019, 40(7): 2838-2846.
[5]	邹佑学, 王睿, 张建民, . 可液化场地碎石桩复合地基地震动力响应分析[J]. 岩土力学, 2019, 40(6): 2443-2455.
[6]	余瑜, 刘新荣, 刘永权, . 基坑锚索预应力损失规律现场试验研究[J]. 岩土力学, 2019, 40(5): 1932-1939.
[7]	王钦科, 马建林, 胡中波, 王滨, . 浅覆盖层软质岩中抗拔桩承载特性现场试验研究[J]. 岩土力学, 2019, 40(4): 1498-1506.
[8]	信亚雯, 周志芳, 马筠, 李鸣威, 陈朦, 汪姗, 胡尊乐, . 基于现场双管试验确定弱透水层水力参数的方法[J]. 岩土力学, 2019, 40(4): 1535-1542.
[9]	唐晓武, 杨晓秋, 俞悦. 开孔管桩复合地基排水固结解析解[J]. 岩土力学, 2019, 40(4): 1248-1254.
[10]	李驰, 王硕, 王燕星, 高瑜, 斯日古楞, . 沙漠微生物矿化覆膜及其稳定性的现场试验研究[J]. 岩土力学, 2019, 40(4): 1291-1298.
[11]	尹锋, 周航, 刘汉龙, 楚剑, . 车辆载重与动荷载对X形桩桩-网复合地基动力特性影响的试验研究[J]. 岩土力学, 2019, 40(4): 1324-1330.
[12]	芮瑞, 孙义, 朱勇, 吴端正, 夏元友, . 刚性基础下复合地基褥垫层细观工作机制[J]. 岩土力学, 2019, 40(2): 445-454.
[13]	任连伟, 孔纲强, 郝耀虎, 刘汉龙, . 基于能量桩现场试验的土体综合热导率系数研究[J]. 岩土力学, 2019, 40(12): 4857-4864.
[14]	陈昌富, 邱琳淇, 毛凤山, 周志军, . 基于加权扰动共生生物搜索算法桩网复合地基优化设计[J]. 岩土力学, 2019, 40(11): 4477-4485.
[15]	崔光耀, 祁家所, 王明胜, . 片理化玄武岩隧道围岩大变形控制现场试验研究[J]. 岩土力学, 2018, 39(S2): 231-237.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed